A man of mass 80kg stands in a lift. If the lift moves upwards with...
FURTHER MATHEMATICS
WAEC 2016
A man of mass 80kg stands in a lift. If the lift moves upwards with acceleration 0.5\(ms^{-2}\), calculate the reaction from the floor of the lift on the man. \([g = 10ms^{-2}]\)
- A. 760N
- B. 800N
- C. 805N
- D. 840N
Correct Answer: D. 840N
Explanation
\(\text{Net force = Upward force - weight}\)
\(ma = F - mg \implies F = ma + mg \)
\(F = (80 \times 10) + (80 \times 0.5) = 800 + 40 = 840N\)
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